Smash out polyseed

coins/monero/wallet/util/README.md

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+# Monero Wallet Utilities
+
+Additional utility functions for monero-wallet.
+
+This library is isolated as it adds a notable amount of dependencies to the
+tree, and to be a subject to a distinct versioning policy. This library may
+more frequently undergo breaking API changes.
+
+### Features
+
+- Support for Monero's seed algorithm
+- Support for Polyseed

coins/monero/wallet/util/src/lib.rs

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+pub use monero_seed as seed;
+pub use monero_polyseed as seed;